Looper or Crossflow

[TrenchFisherman]

what is the difference between a loop system and a crossflow. I have a 1986 evinrude and i am not sure what i have. I don't know if they are even part of the same motor. Someone please advise me on this. I got engine numbers if you need them. Thanks

 

[JB]

Re: Looper or Crossflow

Howdy Shaun.<br /><br />The differences are many. The short version is that crossflow engines have a deflector cast into the piston to deflect the incoming charge up to the combustion chamber and loopers have a flat-top piston and use two intake charges to deflect each other up.<br /><br />

 

[TrenchFisherman]

Re: Looper or Crossflow

thanks for the info.....any clue on what one is better? do both powerheads fit on the same lower unit?

 

[JB]

Re: Looper or Crossflow

Hi, Shaun.<br /><br />Crossflow seems to work better in small engines and low speeds. Most engines under about 8hp are still crossflow.<br /><br />Big engines are mainly loopers now. They are lighter, make more horses per cubic inch, and use less fuel.<br /><br />